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• monitored at two sites: 17-W and 19-W. Both wells are located <br />er;. y^^^~. ~~ent of minim. <br />Well 17-w is locate3 near the Wadge T~ouYZdme^*, and Grater samples <br />collected at this site have a NaC~Mq-SO4 water type. 'IIie Wadge Coal <br />a~+~ i fer at this site receives rec2iazr3e frrau the wadge r~~m~*+t <br />(which receives discharge from the spoils aquifer) and the Little <br />Grassy Creek alluviian. 2DS om>~sztraticros at well 17-W have been <br />increasing since ]980, which is to be expected cozisiderinq the <br />sources of recharge far the Wadge Coal aquifer in this area. <br />Well 19-Fi is located south of the Wadge T+>~~~++~*+t. Wadge Coal <br />az ~; fer water quality at this site is quite different t han seen at <br />well 17-W; the water type is Na-HO03, and ZAS levels are <br />armr„x+'-»~tely one -third of those me asured at 17-w and show a very <br />slight decreasing trerrl. It should be noted that the water quality <br />• observed at 19-'W is quite similar to the water quality mPa~+**~z at <br />other Wadge Goal <br />~~!• monitoring wells that were later d estroyed by <br />Wolf Creek Overbuxtien/Wadge Underburden P4uifer. 2Yzree wells <br />presently monitor water quality, in the Wolf Creek Overburden/Y7adge <br />Ucderburden aquifer: 7-ice, 8P1-U, ard~ S11-U. <br />Well 7-WN is located downdip froze the Wolf Creek pit area, and water <br />sables from this site are distinctly different than those fr®n wells <br />8P1-U atrl S11-U. A CaMg-504 water type is present at 7-Fk70. 29.5 <br />values at 7-FKA have declined since 1987 when a peak 2DS level of <br />1600 mg/1 was measut~ed; the 1991 water year average 2DS oorxentration <br />was 1233 mg/1. <br />Water quality at wells 8P1-U and Sil-U are quite similar. Both wells <br />show a Na-HOD3 water type; 2US oonoentsations are stable and range <br />• between 600 to 700 ag/1. <br />Wolf Creek Coal Awifer. Peabody presently maintains no monitorir-3 <br />7-316 Revised 12/10/92 <br />